#include "muduo/proto/codec.h"
#include "muduo/proto/dispatcher.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include "request.pb.h"
#include <iostream>
#include <unordered_map>

class Server
{ 
public:
    typedef std::shared_ptr<google::protobuf::Message> MessagePtr;
    typedef std::shared_ptr<lyw::TranslateRequest> TranslateRequestPtr;
    typedef std::shared_ptr<lyw::AddRequest> AddRequestPtr;
    Server(int port)
    :_server(&_baseloop, muduo::net::InetAddress("0.0.0.0", port)
            , "Server", muduo::net::TcpServer::kReusePort)
    ,_dispatcher(std::bind(&Server::onUnknownMessage, this, std::placeholders::_1, 
        std::placeholders::_2, std::placeholders::_3))
    ,_codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, std::placeholders::_1, 
        std::placeholders::_2, std::placeholders::_3))
    {
        // 注册业务请求处理函数
        _dispatcher.registerMessageCallback<lyw::TranslateRequest>(std::bind(&Server::onTranslate, this, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _dispatcher.registerMessageCallback<lyw::AddRequest>(std::bind(&Server::onAdd, this, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        
        _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, &_codec, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _server.setConnectionCallback(std::bind(&Server::onConnection, this, std::placeholders::_1));
    }
    void start()
    {
        _server.start();
        _baseloop.loop();
    }
private:
    std::string translate(const std::string& str)
    {
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"},
            {"apple", "苹果"},
            {"happy", "开心"}
        };
        auto it = dict_map.find(str);
        if (it == dict_map.end())
            return "没有找到！";
        return it->second;
    }
    void onTranslate(const muduo::net::TcpConnectionPtr& conn, const TranslateRequestPtr& message, muduo::Timestamp)
    {
        // 提取message中的有效消息
        std::string req_msg = message->msg();
        // 翻译
        std::string resp_msg = translate(req_msg);
        // 组织protobuf响应
        lyw::TranslateResponse resp;
        resp.set_msg(resp_msg);
        // 发送响应
        _codec.send(conn, resp);
    }
    void onAdd(const muduo::net::TcpConnectionPtr& conn, const AddRequestPtr& message, muduo::Timestamp)
    {
        // 与翻译基本相同
        int num1 = message->num1();
        int num2 = message->num2();
        int result = num1 + num2;
        lyw::AddResponse resp;
        resp.set_result(result);
        _codec.send(conn, resp);
    } 
    void onUnknownMessage(const muduo::net::TcpConnectionPtr& conn, const MessagePtr& message, muduo::Timestamp) {
            LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
            conn->shutdown();
    }
    void onConnection(const muduo::net::TcpConnectionPtr& conn)
    {
        if (conn->connected())
            LOG_INFO << "新连接建立成功！";
        else
            LOG_INFO << "连接即将关闭！";
    }
private:
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server; // 服务器对象
    ProtobufDispatcher _dispatcher; // 请求分发器对象
    ProtobufCodec _codec; // protobuf协议处理器
};

int main()
{
    Server server(8080);
    server.start();

    return 0;
}